de puydt and h



A. DE PUYDT AND H DE ILEMINCK.

HYDRAULIC TRANSMISSION OF POWER.

Patenteol M2112 9,1920.

2 SIIEZ'IS-oHEET I.

I I I I In-W I h. H n W UM APPLICATION FILED JULY I8, 1919.

In II 1 I III HI I I II II I u I II A. DE PUYDT AND H. DE VLEIVIINCK.

HYDRAULIC TRANSMISSION OF POWER.

APPLICATION FILED JULY 18,1919.

Patented Mar 9,1920

' 2 SHEETS-SHEET 2.

scrlptio UYDGE subggects of sidents' oif Liege,

hereby declare the clear, and exact deon, such as will eh- .i in the artshie otl Mrs sril.

1 pertains to melre and use the same reference the piston pumpsbycentritugal.

en'ables the speed of the charge opening of the osing? had to.the-occmpan ins drawin s and to letters or figuresoifireterencemarkedtherein, which form a part of this specification, pThis invention relates to a system.;ot

power transmission in Whichia motor, which maybe a constaiit speedmotor, operates a pump supplyingliquld under pressure to a liquidmotorgdesigned to operate at variable speed,

In mechanisms of this kind known hitherto piston vpumps have beenemployed they complicate the system very much" because it is necessarytoprovide means for reducing the output of the piston pump in proportion,to the consumption of the liquid motor, which varies with its speed. 7

RT his inconvenience is avoided in the subject ofthe presentinvention'by replacing which the output is selzhlimiting. v

ll/loreover,- the use of "centrifugal pumps, liquid motor to be the areaof the disrnotorg this-is a very simple method of regulation whichprevents controlled by varying sudden changes otmotion or hammering. of

the liquid in the motor, and, further, itenablesabrakingeft'ect tobe'secured-when the motor is maintained in movement ldythe 1110- mentumof the parts'which it drives. The.

'- direction of movement of the liquid motor ofthe admission anddischorgepipes;

may be reversed by reversing, for instance by means er a four-way cook,the functions The invention further contemplates 'ameans or reducing theexpenditure of energy When the liquid motor is operdtinget a low output,This means consists in lessening the ,pressure of the liquid motor. Forthis pumps, arranged inser-ies -are employed to produce the normalworking; ct these one or more can be r min-new and useydrouhcTransxn1sto which itap two distributing pistons 12 pumps in" supplied"to, the purposeseveralcentrifugal be lessened upon the-vehlcle. ressure,and

put out of actiomflcock 18' is so arranged that the discharge onlypresent" F The one form of construction or? the invention to applied atractor.

Figure l is a side view oi? the installation with. parts in section.

Fig 2 is an end view of the constant speed motor and the centrifugalpumps 2,

Um I drawings show by of example Fig. .3 is an enlarged centrifugalpumps. I In the form of construction shown, a threephase motor- 1, whichmay be of con.-v

stant speed, is directly coupled to the shaft of three centrifugal pumpsplaced within the same casing.- The three rote'ry'memhe'r's of the pumpsoperate in series if the cocks 6; and 7 are closed and cock 8 is opened.The

I pressure is reduced totw'o thirds if the cock Z alone is opened; and apressure of one detail section of ,the

thilrd can-be obtained by opening the cock 6' s on y,

. The variable speed motor 9 is a motor: I with a piston, which drives,through a connecting rod and crank, the axle 10 ofthetractor. The valvecylinder 11', in'Which reciprocate under the action of the lever 13, isconnected on the onehanhl with the pipe '14 by a central port 15, and onthe other hand with the pipe 17 by-two. ports 16, one at each end of the-cylinder.- The two pipes 14 and 17.- serve alternatively/"5 asadmission and dischargej' pipes-for the motor 9, and for this purposeare'connected to a four-way cockl-S, whichcontrols also the pipe8', bywhich liquid-"is supplied trom the pumpsgand the pipe 19 by which liquidis'returned to the reservoir 5. According to the position of thec'ock'18 liquid supplied through the pipe 8 may be forwarded through thepipe 14, serving as an admission pipe and returned to the reser- 'voir,throughpipes l7 and 1-9. The motor will drive in one direction or'theother ac 1'00 when the pipe is'acting as adischorge pipe"; hymore orless throttling the discharge pipe by means of this cock',

and so producing a I back-pressure, "the speed of the motor Q-m'ay anda. braking efiect exerted I The cocks 20 older mt}? be omitted-if theopenings;

. attained by providing instead ofanordinary.four-wayrcocki T he pipe 8has a branch conneeting with a, 1 v'reserv eta--22 "containing air,which as to take up shocks ationvbyimeans of the three-way cook 24 511:the Shaft is rotated by anothermotor, the

- Idriving Wheels and :lic-motorcomprising'a cylinder and;a.pis-vtherein-and connected av "centrifugaljpi mp; 'a'pi'pe'; System'eonnecting said pump and, hydraulie {motor for {supplying ablemechanism Whatever.

drive one or more groups of -=pumps; r larly, le'aeh 'sei eta'l'yariable 'speed motors.

{Ingthisl case; zg-jput of liquid, the speed of some of theinoy 'moreo'th'ers' out of action.

through it can be closed before it's otherv for'in'stahce, be} 18. a Islide valve;

reoiproeating therein and connected with" .55

This end. may,

' ftanee; when the tractoi' :is traveling. llght'; 115

tor :1 may be any sort of, electric "motor;

internal-combustion. engine, I and so for h-, and may drive the pumps)through-any jsuit;

The'motorwmay; .-1'Sin 1 -i'- j tr'ol' 1 p". f Pumps ay 0' withoutincreasing thetors may be increased putting onefo *The motor shown maybe p it'jont' o-faaq ;m0tor put out of action wil-l operate-,.oWing--to" the pipe 25,'as" a vpnm'1i short-'cil cuitedon.

itself; .The jpreesufe. I

oti'ited system will he thegpreseure due. to 'the-=.. "pump- 2 or.atliiospheriopressure accor d j ingv'tothe positiono'f the cofek"l8, i.algae j t cording to the direction of rotation of'the-i' ifmoton (Theliquid-"enip Within this' 'short cii glycennoranysu table-liquid. 1'1.In'a tractor, the combination, With-the their axle, of. a hydi atp tonieeiprocattihgv with said axle;

the purposeof 1 I-t-is obvious that the cjonstant speedno bled/maybe e;011;."

i of interseet'io moti'y'ej fluid ,iuider} 'es surefrom the former tothe latter; and 7 anel ectric motorgfor operating Said-pump 1ata-leQnstant'speed i; a I

.2. ail-tractor, combination; with: the

*sai'daxle; .acentrifugal pump a pipe ;sys-- "'hydraulie. v V "iinoto'i'foi supplying motive-[fluid under, the Iiquidf '.[-l1is reservoil; isprovided with} i manometer-23'. v l t The use of several pmnpsinsefie'senables the, pressnre of the liquid ,euppliedtotthef hydraulicmotof'toiloel les's'enedf when Lthef,

fl -motor is operating on small-output; 'fo in-.-

teni ,iconneeting said. pump; and

pressure xfrom the; I former to the 5 latter ivary' "itegpeed'; and an:Constan speed. I

niotor-fcomprisingi a cylinder" .and'a piston ,fiuid through'simd pipesystem tofreverse' the direction; of; movement of, thei-hydifaulic'mosaid p imp-at ahonstant speed.

tor j and U electr c motor fo'r .operatihg 'jl eeip'rooating there njandjconnected with fluid" resfour. pip s having a' comlhon point of intersction, said-set including-alsupply pipe' "leadiiig::f roin;said pump,-ihg;t0 ,saidi'esei-voi1:,.and a pair, of pipes -jinnected ,lto, said"hydraulic motor and m a IGLUIILPIPB leadstituting}. inlet and exhaustvmeansv 'ifor the n of said pipes for controlling .-1;1 j iretionof,fiow therethrough; and an electric m'otor .foif jopei atihgsaid pump ata constant Speed, .t

1 Iii-testimony whereof we affix oursigna 'tnresfin presencevof twoitnesses ":ALBERT DE. PUYDT, v

QH-IPPOLYTEI'DE VLEMI K. Q

f lVitnessQes':

-.meanefior regulating the discha ge' f-rom the i v hydraulic motortoe1e'ctrioi='m9t0l"- f lj-iopeyatingfsaid pump av motoi'f' ,eompr1s1ngaeylinde1" and piston pump; .a-' pipe systemc'omprising a set of v 15'i1;atraetof,theeombinatiom with the drivlligwheels and their axle, of ahydraulic

